geom_density2d
geom_density2d(mapping=NULL, data=NULL, stat="density2d", position="identity", ...)
Contours from a 2d density estimate
Perform a 2D kernel density estimatation using kde2d and display the results with contours.
This page describes geom_density2d, see layer and qplot for how to create a complete plot from individual components.
Advice
This can be useful for dealing with overplotting.
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Aesthetics
The following aesthetics can be used with geom_density2d. Aesthetics are mapped to variables in the data with the aes function: geom_density2d(aes(x = var)). Note that you do not need quotes around the variable name.
Scales control how the variable is mapped to the aesthetic and are listed after each aesthetic.
| Aesthetic | Default | Related scales |
|---|---|---|
| x | required | continuous, date, datetime, discrete |
| y | required | continuous, date, datetime, discrete |
| weight | 1 | |
| colour | #3366FF | brewer, gradient, gradient2, gradientn, grey, hue, identity, manual |
| size | 0.5 | identity, manual, size |
| linetype | 1 | identity, linetype, manual |
| alpha | 1 |
Layers are divided into groups by the group aesthetic. By default this is set to the interaction of all categorical variables present in the plot.
Parameters
Parameters control the appearance of the geom. In addition to the parameters listed below (if any), any aesthetic can be used as a parameter, in which case it will override any aesthetic mapping.
arrow: NULL
Returns
This function returns a layer object.
See also
- geom_contour: contour drawing geom
- stat_sum: another way of dealing with overplotting
Examples
> # See stat_density2d for examples
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